Benchmark: EGO indexOf vs regex vs RegExp

Script Preparation code:

var str = "This is a simple test! Over 20 Distinct Floor Plans Modern Quartz Countertops Complete Stainless Steel GE Appliances Moen Fixtures Oval Soaking Tubs Washer and Dryer in Every Home Central Air and Heat Overside Balconies and Patios Fiber-Based Internet Speeds at 25/15, 50/25, and 100/50 (Faster Enterprise Speeds Available). Over 20 Distinct Floor Plans Modern Quartz Countertops Complete Stainless Steel GE Appliances Moen Fixtures Oval Soaking Tubs Washer and Dryer in Every Home Central Air and Heat Overside Balconies and Patios Fiber-Based Internet Speeds at 25/15, 50/25, and 100/50 (Faster Enterprise Speeds Available). Over 20 Distinct Floor Plans Modern Quartz Countertops Complete Stainless Steel GE Appliances Moen Fixtures Oval Soaking Tubs Washer and Dryer in Every Home Central Air and Heat Overside Balconies and Patios Fiber-Based Internet Speeds at 25/15, 50/25, and 100/50 (Faster Enterprise Speeds Available). Over 20 Distinct Floor Plans Modern Quartz Countertops Complete Stainless Steel GE Appliances Moen Fixtures Oval Soaking Tubs Washer and Dryer in Every Home Central Air and Heat Overside Balconies and Patios Fiber-Based Internet Speeds at 25/15, 50/25, and 100/50 (Faster Enterprise Speeds Available). Over 20 Distinct Floor Plans Modern Quartz Countertops Complete Stainless Steel GE Appliances Moen Fixtures Oval Soaking Tubs Washer and Dryer in Every Home Central Air and Heat Overside Balconies and Patios Fiber-Based Internet Speeds at 25/15, 50/25, and 100/50 (Faster Enterprise Speeds Available). Controlled Access Community Podium Lounge with Billiards Table Fitness Facility Professional Conference Room Business Center Private Screening Room Dog Park and Washing Station Secure and Reserved Parking Garage Valet Dry Cleaning This is a simple test! . Controlled Access Community Podium Lounge with Billiards Table Fitness Facility Professional Conference Room Business Center Private Screening Room Dog Park and Washing Station Secure and Reserved Parking Garage Valet Dry Cleaning This is a simple test! . Controlled Access Community Podium Lounge with Billiards Table Fitness Facility Professional Conference Room Business Center Private Screening Room Dog Park and Washing Station Secure and Reserved Parking Garage Valet Dry Cleaning This is a simple test! . Controlled Access Community Podium Lounge with Billiards Table Fitness Facility Professional Conference Room Business Center Private Screening Room Dog Park and Washing Station Secure and Reserved Parking Garage Valet Dry Cleaning On a very large Text string containing Community Amenities or Apartment Amenities";
var searchText = "community amenities";
var ri = new RegExp('community amenities', 'i');

Tests:

lowercase, trim, indexof
var a = str.toLowerCase().trim(); var b = searchText.toLowerCase().trim(); var c = a.indexOf(b) > -1;
trim, lowercase, indexof
var a = str.trim().toLowerCase(); var b = searchText.trim().toLowerCase(); var c = a.indexOf(b) > -1;
regex
var c = /simple/i.test(str);
lowercase, replace, indexof
var a = str.toLowerCase().replace(" ", ""); var b = searchText.toLowerCase().replace(" ", ""); var c = a.indexOf(b) > -1;
RegExp
var c = (new RegExp(searchText, 'i')).test(str);
Same RegExp
var d = ri.test(str)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lowercase, trim, indexof
trim, lowercase, indexof
regex
lowercase, replace, indexof
RegExp
Same RegExp

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36

Browser/OS: Chrome 92 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lowercase, trim, indexof	753721.2 Ops/sec
trim, lowercase, indexof	849627.6 Ops/sec
regex	7606996.0 Ops/sec
lowercase, replace, indexof	722670.0 Ops/sec
RegExp	993669.2 Ops/sec
Same RegExp	1398483.2 Ops/sec

Autogenerated LLM Summary (model gemma2:9b, generated 2 months ago):

LLMs can make mistakes. Check important info.

This benchmark compares different approaches to finding the substring "community amenities" within a large text string.

Here's a breakdown of each test case:

**1. `lowercase, trim, indexof`:**

*   Converts the target string and the search string to lowercase using `toLowerCase()`.
*   Trims any leading or trailing whitespace from both strings.
*   Uses the `.indexOf()` method to find the starting position of the target substring within the text.

**2. `trim, lowercase, indexof`:**

*  Similar to the previous approach but swaps the order of `toLowerCase()` and `.trim()`.  This might seem insignificant, but JavaScript's optimization can sometimes be affected by the order of operations.

**3. `lowercase, replace, indexof`:**

*   Replaces all occurrences of whitespace in the target string with a single space using `replace(/\s/g, ' ')`. 
*   Then converts the target string to lowercase.
*   Uses `.indexOf()` to find the substring's position.

**4. `RegExp`:**

*   Creates a new `RegExp` object with the target string and the "i" flag for case-insensitive matching.
*   Uses the `.test()` method of the `RegExp` object to check if the pattern exists within the text.

**5.  `Same RegExp`**

* This test uses a pre-defined `RegExp` (ri) created earlier in the script. It directly applies this `RegExp` to the text using the `.test()` method, similar to the "RegExp" test.

**6. `regex`:**

*   This is likely the simplest approach, directly using the JavaScript regular expression `/.+community.+amenities./i`  to search for the substring within the text.

The benchmark results show that using a pre-defined `RegExp` (`Same RegExp`) and the basic JavaScript regular expression (`regex`) are generally the fastest approaches in this particular scenario.

**Alternatives & Considerations:**

*   **String Methods (split, join):**  For simple string manipulations like replacing whitespace, you could explore alternatives like `.split()` and `.join()`.
*   **Libraries (like Lodash):** Libraries like Lodash offer optimized functions for common tasks like searching within strings.

Let me know if you have any more questions about specific aspects of the benchmark!

Related benchmarks:

EGO indexOf vs regex vs RegExp (version: 2)

Comparing performance of: lowercase, trim, indexof vs trim, lowercase, indexof vs regex vs lowercase, replace, indexof vs RegExp vs Same RegExp

Created: 3 years ago by: Registered User

Jump to the latest result

lowercase, trim, indexof

trim, lowercase, indexof

regex

lowercase, replace, indexof

RegExp

Same RegExp

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated 2 months ago):